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Rifles, Reloading, Optics, Equipment
Reloading
Weird Issue with Run out
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<blockquote data-quote="Mikecr" data-source="post: 458466" data-attributes="member: 1521"><p>I think y'all are misunderstanding the concept of runout -vs- concentricity..</p><p>I know Sinclair merchandises Aldon's tool as a concentricity gage, but that is not at all what it is. It is a RUNOUT gage.</p><p></p><p>Runout cannot be automatically be declared as 1/2 of total indicated from given centerpoint. There is no centerpoint here. </p><p>It simply is what it is, until further defined. </p><p>Cartridge brass is not round, it's roundish. It's not straight, but somewhat straight. It's not uniform, but varies in thickness, and springs back into many possible forms.</p><p>The same holds for the chamber your brass formed in, and the barrel steel around it.</p><p>The runout you measure on your Sinclair amounts to the sum of these factors, and is not just +/- 180degs. No way to make that assumption..</p><p></p><p>The fact that runout is very hard to conceal from the Sinclair is what makes it such a useful tool for working all the bugs out in reloading. It just won't allow you to deny the fact that your loaded ammo is not straight,, Yet..</p><p></p><p>I respect your endeavor here Aldon. No doubt you're learning alot, and will soon be producing very good ammo. As mentioned(a Redding link), the best approach to reducing runout is to cut the head off the snake(culling brass by thickness variance). </p><p>Then, the lowest runout you'll ever measure is from brass still smoking from the chamber. Each and every single thing you do to brass from there, increases runout. So to manage truly low runout, means doing as little to the brass as possible. </p><p>And this is what anyone should strive to do.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 458466, member: 1521"] I think y'all are misunderstanding the concept of runout -vs- concentricity.. I know Sinclair merchandises Aldon's tool as a concentricity gage, but that is not at all what it is. It is a RUNOUT gage. Runout cannot be automatically be declared as 1/2 of total indicated from given centerpoint. There is no centerpoint here. It simply is what it is, until further defined. Cartridge brass is not round, it's roundish. It's not straight, but somewhat straight. It's not uniform, but varies in thickness, and springs back into many possible forms. The same holds for the chamber your brass formed in, and the barrel steel around it. The runout you measure on your Sinclair amounts to the sum of these factors, and is not just +/- 180degs. No way to make that assumption.. The fact that runout is very hard to conceal from the Sinclair is what makes it such a useful tool for working all the bugs out in reloading. It just won't allow you to deny the fact that your loaded ammo is not straight,, Yet.. I respect your endeavor here Aldon. No doubt you're learning alot, and will soon be producing very good ammo. As mentioned(a Redding link), the best approach to reducing runout is to cut the head off the snake(culling brass by thickness variance). Then, the lowest runout you'll ever measure is from brass still smoking from the chamber. Each and every single thing you do to brass from there, increases runout. So to manage truly low runout, means doing as little to the brass as possible. And this is what anyone should strive to do. [/QUOTE]
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Weird Issue with Run out
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